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Reference.org
Boeing Model 42
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<p>The Boeing Model 42 (also Boeing XCO-7 for Experimental Corps Observation Model 7) was an American biplane aircraft developed from the <a href="/facts/Airco_DH.4/AcRoQ0CG">Airco DH.4</a>, taking advantage of the large number of aircraft left over after the end of <a href="/facts/World_War_I/vITTUanQ">World War I</a>. </p>